[CentOS] Apache jserv monitoring?

[Ray Leventhal]

Sean Carolan wrote:
> In our environment we have many legacy application servers running
> apache/jserv.  There is a web server front end, then a couple of
> load-balanced java servers on the backside.  One of the problems we
> are faced with is hung or stuck jvms.  I have looked at the java
> process with the ps command, and there are many times when URL(s) do
> not respond, yet the java looks healthy, at least from the OS point of
> view.  The usual cure for this situation is to restart the JVM, then
> the URLs come right back up.
>
> Are any of you aware of tools for monitoring apache jserv, either from
> localhost or by connecting to port 8008 over the network?  I really
> want to find out if there is a way to detect a "sick" JVM other than
> getting a bunch of down URL alerts on my phone.
>   
Being far from an expert, if restarting a service or script is what's 
needed, you might find SIM[1] helpful

YMMV,
-R

[1]http://rfxnetworks.com/sim.php